Now with the recent Xbox 360 unvieling at the ridiculously worthless MTV event a couple of days ago (look at the OurColony video here for a much better presentation) there have been quite a lot of speculation on what games are coming to the new console. One of the games that was announced was Project Gotham Racing 3 which caused enthusiastic speculation that RalliSport Challenge 3 also was in development.
As far as I know, as one of the developers on both RalliSport Challenge 1 and 2 here at DICE, that isn't the case. At least not at DICE since we are more or less a part of EA now and they aren't that big on platform exclusive titles (or titles that sell less than one million copies). But since Microsoft owns the RalliSport IP they can develop the game themselves or let another studio do it for them. That would be kinda cool and interesting to look at but I doubt it will happen since RSC2 unfortunately wasn't really a commercial hit for them.
For all RalliSport and Xbox 360 fans I've dug up a couple of high-resolution development screenshots (720p with really good antialiasing) of RSC2 so you could get a glimpse of what RalliSport Challenge 3 on Xbox 360 might have looked like at a minimum. If we would do a sequel on Xbox 360 it would look a lot better than this tough, trust me..